完型填空。阅读下面短文，从短文后各题所给的四个选项(A、B、C和D)中，选出可以填入空白处的最佳选项。
My wife and I moved into our home two years ago. We had a yard with a lot of 21 ．Very often when we have flowers, Denise or I would plant some between the rocks, just to add some 22 to the area．
Last summer, I found a tiny little 23 in the yard that I could not immediately identify. I knew I didn’t plant it and Denise said she didn’t either. We decided to let it 24 growing until we could find out what it was.
Weeks passed and as I made my way back to the 25 plant, it appeared to be a sunflower. I decided to 26 the weeds around it. As I pulled rocks from the area to get to the weeds, I noticed something 27 . The sunflower had not 28 where I saw it begin. It actually had begun under a big 29 and grown under and around it to reach the 30 ．
